Perhaps you should try some spelling variations:
"vi quan luan snippets" » "va quan luan snippets", "ve quan luan snippets", "vo quan luan snippets", "vi quan lan snippets", "vi quan luan slippers"
"using low java snippets" » "using low java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("vi quan luan snippets") or ("using low java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vi quan luan snippets") OR ("using low java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vi quan luan snippets ) or ( using low java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vi quan luan snippets") or ("using low java snippets"))) or ("locating bug code snippets"))*.